Firestone Library opened in 1948, as the first large American university library constructed after World War II. Roughly 1.5 million volumes were moved during the summer of 1948 from East Pyne Hall, which until then had served as the University's main library.

The library building was expanded in 1971 and again in 1988 and currently has more than 70 miles (110 km) of bookshelves, making Firestone one of the largest open-stack libraries in existence. Though not the largest university library in the world, the library has more books per enrolled student than that of any other university in the United States.

According to wikipedia